Serving sector interference broadcast and corresponding RL traffic power control

ABSTRACT

Systems and methodologies are described that facilitate broadcasting an interference level and adjusting transmit power corresponding to a reverse link in accordance with the interference level. An interference indication can be broadcasted on a broadcast channel in a wireless communication system. In response to the broadcast, mobile devices can adjust transmit power on the reverse link based upon considerations of the interference level. Further, mobile devices can evaluate an initial set point of a transmit power level during periods of inactivity.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Patentapplication Ser. No. 60/843,040 entitled “METHODS AND APPARATUS FORSERVING SECTOR INTERFERENCE BROADCAST AND A CORRESPONDING RL TRAFFICPOWER ADJUSTMENT” which was filed Sep. 8, 2006. The entirety of theaforementioned application is herein incorporated by reference.

The present application for patent is a divisional and claims priorityfrom Utility patent application Ser. No. 11/851,153, filed Sep. 6, 2007,entitled “SERVING SECTOR INTERFERENCE BROADCAST AND CORRESPONDING RLTRAFFIC POWER CONTROL” and is assigned to the assignee hereof and herebyexpressly incorporated by reference herein.

BACKGROUND

I. Field

The following description relates generally to wireless communications,and more particularly interference broadcast and reverse link poweradjustment.

II. Background

Wireless networking systems have become a prevalent means by which amajority of people worldwide communicate. Wireless communication deviceshave become smaller and more powerful in order to meet consumer needsand to improve portability and convenience. Consumers have becomedependent upon wireless communication devices such as cellulartelephones, personal digital assistants (PDAs) and the like, demandingreliable service, expanded areas of coverage and increasedfunctionality.

Generally, a wireless multiple-access communication system maysimultaneously support communication for multiple wireless terminals oruser devices. Each terminal communicates with one or more access pointsvia transmissions on the forward and reverse links. The forward link (ordownlink) refers to the communication link from the access points to theterminals, and the reverse link (or uplink) refers to the communicationlink from the terminals to the access points.

Wireless systems may be multiple-access systems capable of supportingcommunication with multiple users by sharing the available systemresources (e.g., bandwidth and transmit power). Examples of suchmultiple-access systems include code division multiple access (CDMA)systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, and orthogonal frequencydivision multiple access (OFDMA) systems.

Typically, each access point supports terminals located within aspecific coverage area referred to as a sector. A sector that supports aspecific terminal is referred to as the serving sector. Other sectors,not supporting the specific terminal, are referred to as non-servingsectors. Terminals within a sector can be allocated specific resourcesto allow simultaneous support of multiple terminals. However,transmissions by terminals in neighboring sectors are not coordinated.Consequently, transmissions by terminals at sector edges can causeinterference and degradation of terminal performance.

SUMMARY

The following presents a simplified summary of one or more embodimentsin order to provide a basic understanding of such embodiments. Thissummary is not an extensive overview of all contemplated embodiments,and is intended to neither identify key or critical elements of allembodiments nor delineate the scope of any or all embodiments. Its solepurpose is to present some concepts of one or more embodiments in asimplified form as a prelude to the more detailed description that ispresented later.

In accordance with one or more aspects and corresponding disclosurethereof, various aspects are described in connection with facilitatingadjusting transmit power levels for the reverse link in mobile devicesbased upon considerations of a level of interference in a wirelesscommunication system. In particular, an indication of interference(e.g., an interference level and/or a function of the interferencelevel) can be broadcasted by a serving base station on a broadcastchannel to a plurality of mobile devices. The mobile devices utilize thebroadcasted interference indication, among other things, to modifytransmit power for reverse link transmissions.

According to related aspects, a wireless communications system employingserving sector broadcast and reverse link power control is describedherein. In an aspect, a method that facilitates generating aninterference indication in a wireless communications system, comprisesmeasuring a received interference level, determining a function of thereceived interference level and broadcasting the function of thereceived interference level on a physical channel to a plurality ofmobile devices to enable quick power adjustment.

In accordance with another aspect, a wireless communications apparatuscomprises a memory that retains instructions related to determining aninterference value associated with other sector interference, developinga function of the interference value and broadcasting the function withlow latency to a plurality of mobile devices and an integrated circuitcoupled to the memory, configured to execute the instructions retainedin the memory.

In accordance with yet another aspect, a wireless communicationsapparatus that generates an interference indication comprises means foridentifying an interference level, means for evaluating a function ofthe interference level and means for transmitting the function of theinterference level in a small number of slots to one or more mobiledevices to enable power adjustment.

According to another aspect, a computer-readable medium comprises codefor causing a computer to measure interference received at a basestation, code for causing a computer to generate a function of aninterference level value derived from the measured interference and codefor causing a computer to broadcast the function on a physical broadcastchannel in a small number of slots to a plurality of mobile devices.

In accordance with another aspect, in a wireless communication system,an apparatus comprises an integrated circuit configured to determine aninterference value related to the amount of interference received fromnon-serving sectors and package the interference value as a function ofthe value.

According to yet another aspect, a method that facilitates adjustingpower based upon interference information comprises receiving aninterference indication, evaluating a power adjustment value based atleast in part on the received interference indication and adjustingtransmit power on the reverse link based upon the power adjustmentvalue.

In accordance with another aspect, a wireless communications apparatuscomprises a memory that retains instructions related to processing aninterference value on a broadcast channel, inferring a power adjustmentvalue based upon the interference value and changing a power levelaccording to the power adjustment value and an integrated circuitcoupled to the memory, configured to execute the instructions retainedin the memory.

According to another aspect, a wireless communications apparatus thatadjusts power on a reverse link comprises means for receiving aninterference indication from a broadcast channel, means for determininga power adjustment value based upon the interference indication andmeans for modifying a transmit power level in accordance with thedetermined power adjustment value.

In accordance with yet another aspect, a computer-readable mediumcomprises code for causing a computer to receive a broadcastedinterference value, code for causing a computer to evaluate a powercorrection parameter based at least in part on the received interferencevalue and code for causing a computer to modify transmit power on thereverse link based upon the power correction value.

In accordance with another aspect, in a wireless communication system,an apparatus comprises an integrated circuit configured to evaluate apower adjustment quantity based at least in part upon consideration ofbroadcasted interference values related to non-serving sectors andadjust a transmit power level on a reverse link in accordance with thepower adjustment quantity.

To the accomplishment of the foregoing and related ends, the one or moreembodiments comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative aspects ofthe one or more embodiments. These aspects are indicative, however, ofbut a few of the various ways in which the principles of variousembodiments may be employed and the described embodiments are intendedto include all such aspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustration of a wireless communication system inaccordance with various aspects set forth herein.

FIG. 2 is an illustration of an example communications apparatus foremployment within a wireless communications environment.

FIG. 3 is an illustration of an example wireless communications systemthat effectuates power control based upon an interference levelbroadcast.

FIG. 4 is an illustration of a wireless communication system inaccordance with one or more aspects presented herein.

FIG. 5 is an illustration of an example methodology that facilitatesbroadcasting an interference level for power adjustments.

FIG. 6 is an illustration of an example methodology that facilitatesadjusting transmit power based upon an interference level broadcast.

FIG. 7 is an illustration of an example methodology that facilitatesreducing interference caused by an initial burst transmission.

FIG. 8 is an illustration of an example mobile device that facilitatesdetermining a power level offset value and adjusting a power level.

FIG. 9 is an illustration of an example system that facilitatesgenerating a interference level broadcast to control power leveladjustments.

FIG. 10 is an illustration of an example wireless network environmentthat can be employed in conjunction with the various systems and methodsdescribed herein.

FIG. 11 is an illustration of an example system that facilitatesgenerating an interference indication.

FIG. 12 is an illustration of an example system that facilitates powerlevel adjustment.

DETAILED DESCRIPTION

Various embodiments are now described with reference to the drawings,wherein like reference numerals are used to refer to like elementsthroughout. In the following description, for purposes of explanation,numerous specific details are set forth in order to provide a thoroughunderstanding of one or more embodiments. It may be evident, however,that such embodiment(s) may be practiced without these specific details.In other instances, well-known structures and devices are shown in blockdiagram form in order to facilitate describing one or more embodiments.

As used in this application, the terms “component,” “module,” “system,”and the like are intended to refer to a computer-related entity, eitherhardware, firmware, a combination of hardware and software, software, orsoftware in execution. For example, a component may be, but is notlimited to being, a process running on a processor, a processor, anobject, an executable, a thread of execution, a program, and/or acomputer. By way of illustration, both an application running on acomputing device and the computing device can be a component. One ormore components can reside within a process and/or thread of executionand a component may be localized on one computer and/or distributedbetween two or more computers. In addition, these components can executefrom various computer readable media having various data structuresstored thereon. The components may communicate by way of local and/orremote processes such as in accordance with a signal having one or moredata packets (e.g., data from one component interacting with anothercomponent in a local system, distributed system, and/or across a networksuch as the Internet with other systems by way of the signal).

Furthermore, various embodiments are described herein in connection witha mobile device. A mobile device can also be called a system, subscriberunit, subscriber station, mobile station, mobile, remote station, remoteterminal, access terminal, user terminal, terminal, wirelesscommunication device, user agent, user device, or user equipment (UE). Amobile device may be a cellular telephone, a cordless telephone, aSession Initiation Protocol (SIP) phone, a wireless local loop (WLL)station, a personal digital assistant (PDA), a handheld device havingwireless connection capability, computing device, or other processingdevice connected to a wireless modem. Moreover, various embodiments aredescribed herein in connection with a base station. A base station maybe utilized for communicating with mobile device(s) and may also bereferred to as an access point, Node B, or some other terminology.

Moreover, various aspects or features described herein may beimplemented as a method, apparatus, or article of manufacture usingstandard programming and/or engineering techniques. The term “article ofmanufacture” as used herein is intended to encompass a computer programaccessible from any computer-readable device, carrier, or media. Forexample, computer-readable media can include but are not limited tomagnetic storage devices (e.g., hard disk, floppy disk, magnetic strips,etc.), optical disks (e.g., compact disk (CD), digital versatile disk(DVD), etc.), smart cards, and flash memory devices (e.g., EPROM, card,stick, key drive, etc.). Additionally, various storage media describedherein can represent one or more devices and/or other machine-readablemedia for storing information. The term “machine-readable medium” caninclude, without being limited to, wireless channels and various othermedia capable of storing, containing, and/or carrying instruction(s)and/or data.

Referring now to FIG. 1, a wireless communication system 100 isillustrated in accordance with various embodiments presented herein.System 100 comprises a base station 102 that may include multipleantenna groups. For example, one antenna group may include antennas 104and 106, another group may comprise antennas 108 and 110, and anadditional group may include antennas 112 and 114. Two antennas areillustrated for each antenna group; however, more or fewer antennas maybe utilized for each group. Base station 102 may additional include atransmitter chain and a receiver chain, each of which can in turncomprise a plurality of components associated with signal transmissionand reception (e.g., processors, modulators, multiplexers, demodulators,demultiplexers, antennas, etc.), as will be appreciated by one skilledin the art.

Base station 102 may communicate with one or more mobile devices such asmobile device 116 and mobile device 122; however, it is to beappreciated that base station 102 may communicate with substantially anynumber of mobile devices similar to mobile devices 116 and 122. Mobiledevices 116 and 122 can be, for example, cellular phones, smart phones,laptops, handheld communication devices, handheld computing devices,satellite radios, global positioning systems, PDAs, and/or any othersuitable device for communicating over wireless communication system100. As depicted, mobile device 116 is in communication with antennas112 and 114, where antennas 112 and 114 transmit information to mobiledevice 116 over a forward link 118 and receive information from mobiledevice 116 over a reverse link 120. Moreover, mobile device 122 is incommunication with antennas 104 and 106, where antennas 104 and 106transmit information to mobile device 122 over a forward link 124 andreceive information from mobile device 122 over a reverse link 126. In afrequency division duplex (FDD) system, forward link 118 may utilize adifferent frequency band than that used by reverse link 120, and forwardlink 124 may employ a different frequency band than that employed byreverse link 126, for example. Further, in a time division duplex (TDD)system, forward link 118 and reverse link 120 may utilize a commonfrequency band and forward link 124 and reverse link 126 may utilize acommon frequency band.

Each group of antennas and/or the area in which they are designated tocommunicate may be referred to as a sector of base station 102. Forexample, antenna groups may be designed to communicate to mobile devicesin a sector of the areas covered by base station 102. In communicationover forward links 118 and 124, the transmitting antennas of basestation 102 may utilize beamforming to improve signal-to-noise ratio offorward links 118 and 124 for mobile devices 116 and 122. Also, whilebase station 102 utilizes beamforming to transmit to mobile devices 116and 122 scattered randomly through an associated coverage, mobiledevices in neighboring cells may be subject to less interference ascompared to a base station transmitting through a single antenna to allits mobile devices. According to an example, system 100 may be amultiple-input multiple-output (MIMO) communication system. Further,system 100 may utilize any type of duplexing technique to dividecommunication channels (e.g., forward link, reverse link, . . . ) suchas FDD, TDD, and the like.

Turning to FIG. 2, illustrated is a communications apparatus 200 foremployment within a wireless communications environment. Communicationapparatus 200 includes a power level evaluator 202 that determines apower level offset or adjustment value for a mobile device to employ toreduce or account for interference in a serving sector or a neighboringsector. According to one aspect of the subject disclosure, the powerlevel evaluator of communications apparatus 200 evaluates the powerlevel offset for the communication apparatus 200 itself. Power levelevaluator 202 employs an interference level broadcasted from an accesspoint or base station over a broadcast physical channel. In accordancewith one example, the access point or base station broadcasting theinterference level can be in the serving sector. However, it is to beappreciated that the broadcasted interference level may originate from aneighboring or non-serving sector. Power level evaluator 202, ingeneral, evaluates an adjustment value that results in an increase intransmit power whenever communications apparatus 200 is subject toincreased interference and evaluates an adjustment value that results ina decrease in transmit power whenever communications apparatus issubject to little or no interference 200.

Power level evaluator 202 may depend solely on the broadcastedinterference level or a function thereof to determine a power adjustmentvalue. However, it is to be appreciated that other factors can beconsidered in the power control decision. For example, power levelevaluator 202 can employ the quality of service (QoS) level associatedwith data traffic of communication apparatus 200. A low latency QoS datatraffic flow (i.e., traffic with tight latency requirements) requirespower level evaluator 202 to respond aggressively in determining anadjustment value. In contrast, a high latency QoS traffic does notrequire power level evaluator 202 to respond as aggressively.Accordingly, power level evaluator 202 determines a smaller poweradjustment increase for a best efforts QoS user in response to aninterference burst but evaluates a higher power change in a high QoSlevel user (e.g., VoIP or other such application).

Further, power level evaluator 202 determines the adjustment value sothat communications apparatus 200 is allowed to transmit at a powerlevel that is as high as possible while keeping intra-sector (i.e.,between mobile devices or terminals in the same sector) and inter-cell(i.e., between mobile devices or terminals in the different orneighboring sectors) interference to within acceptable limits. Forexample, communication apparatus 200 can be a mobile device locatedclose to a serving access point or base station. Communicationsapparatus 200 can then transmit at a higher power level sincecommunications apparatus 200 is less likely to cause interference toneighbor access point or base stations. Conversely, communicationsapparatus 200 may also located farther away from the serving basestation and/or near a sector edge. In this situation, communicationsapparatus 200 is limited to a lower transmit power as it is more capableof causing high interference to neighboring base stations. Power levelevaluator 202, when accounting for location of communications apparatus200, can establish offset values that potentially reduce totalinterference observed by each access point while allowing particularqualified) mobile devices or terminals (i.e., located near a servingbase station to achieve higher signal-to-noise ratios (SNR) and, thus,higher data rates.

According to an example, power level evaluator 202 may evaluate a poweradjustment or offset value as follows:P _(dch)(n)=P _(ref)(n)+ΔP(n)Pursuant to this illustration, P_(dch)(n) is the transmit power spectraldensity (PSD) for the data channel for update internal n. P_(ref)(n) isa reference PSD level for update interval n. The reference value may beobtained from a pilot channel or from channel reciprocity in a TDDimplementation. However, it is to be appreciated that the referencepower level can be obtained from other sources as known by one ofordinary skill in the art. ΔP(n) is a transmit PSD delta for updateinterval n. The PSD levels P_(dch)(n), P_(ref)(n) and the transmit powerdelta ΔP(n) are given in units of decibels, although it is to beappreciate that other units and/or calculations can be utilized.

The reference PSD level, P_(ref)(n), can be the amount of transmit PSDrequired to achieve a target SNR or erasure rate for a designatedtransmission. The reference PSD level can be provided by a fixed channel(e.g., a channel quality feedback channel, request channel or the like).When the reference power level can achieve the target SNR or erasurerate, the received SNR for the other channel is estimated as follows:SNR_(dch)(n)=SNR_(target) +ΔP(n)

The data channel and the reference or control channel may have similarinterference statistics. For example, interference statistics can besimilar when control and data channels from different sectors interferewith one another. In such a case, the offset can be calculated at aterminal or mobile device. Additionally, the interference offset betweenthe control channels and the data channels can be broadcasted by accesspoints or base stations and power level evaluator 202 can employ thebroadcasted offset.

Power level evaluator 202 can determine the transmit PSD for the datachannel based upon various factors. For example, power level evaluator202 can account for the amount of inter-sector interferencecommunications apparatus 200 may cause to other terminals in neighboringsectors. Additionally, the amount of intra-sector interferencecommunications apparatus 200 is causing to other terminals or mobiledevices within the same sector. For example, data channels for eachsector are multiplexed such that the data channels become orthogonal.Nonetheless, orthogonality may be lost as a result of inter-carrierinterference (ICI), inter-symbol interference (ISI) and the like. Lossof orthogonality causes intra-sector interference. To mitigate thisinterference, power level evaluator 202 evaluates a power leveladjustment such that the amount of intra-sector interference caused bycommunications apparatus 200 to other mobile devices within the samesector is maintained within an acceptable level. One way to achievethis, for example, is to constrain the transmit PSD delta, ΔP(n), asfollows: ΔP(n)ε[ΔP_(min), ΔP_(max)], wherein ΔP_(min) and ΔP_(max) isthe minimum and maximum transmit PSD delta, respectively, allowed for adata channel. Furthermore, the maximum power level of communicationsapparatus 200 and other such factors can be accounted for in the powerlevel decision by power level evaluator 202.

Power level evaluator 202, employing the delta-based power leveladjustment described above or some other control mechanism, is effectivein adjusting transmit power of communications apparatus 200 to controlthe amount of interference at neighboring sectors while communicationsapparatus 200 is continuously transmitting. However, power levelevaluator 202 does not provide an initial set point for transmit poweror power spectral density of communications apparatus 200. The initialset point is the transmit power or PSD value after some period ofinactivity, commonly referred to as a silence period. By way ofillustration, consider a partially loaded scenario. One base station oraccess point is serving a single bursty user that causing interferenceto a neighboring sector. A bursty user is characterized bycommunications having high volumes of data transmitted intermittently asopposed to transmitted as a steady stream. During the silence period,the delta PSD value of the bursty user may increase up to a maximumvalue as the neighboring access point or base station does notexperience any interference during the silence period and, thus, doesnot transmit indications of large other sector interference (OSI). Whenthe bursty user reverts into an active state, the burst transmissioninitially creates a significant amount of interference to theneighboring sector. This high interference continues until the burstyuser has an opportunity to adjust the delta value to an appropriate inan update interval after transmission commences. As large interferencesincreases may result in packet errors or missed reverse linkacknowledgment messages in the neighboring sector, a power adjustmentshould occur at the beginning of each burst.

Communications apparatus 200 includes an open loop evaluator 204 thatperforms open loop adjustments. Open loop evaluator 204 can determinethe open loop adjustment at the beginning of each burst. However,according to an aspect of the subject disclosure, communicationsapparatus 200 may employ open loop evaluator 204 even when not scheduledon some interlaces (e.g., frames or portions of frames). In addition,open loop evaluator 204 can be employed to project a maximum value ofthe delta value to prevent the delta value from increasing due to littleOSI activity. Open loop evaluator 204 can determine the open loop deltavalue directly or based upon bandwidth assigned for transmission.

Accordingly to an example, open loop evaluator 204 may determine an openloop value to control maximum PSD rise. Open loop evaluator 204 maycompute the delta value such that the following is satisfied:(averageIOT+pCoT*delta)/averageIOT<maxIOTRisePursuant to this illustration, averageIOT is an interference offsetvalue that is a system parameter. This value may be broadcasted by thenon-serving sector access point for which the open loop adjustment isbeing determined. In accordance with another aspect, the averageIOTvalue may be from the sector having the smallest channel gain differencewith the serving sector. pCoT is a measurement of received signal poweron a reference channel at the non-serving sector. The measurement canbe, for example, a received carrier PSD over thermal PSD. Further, thereference channel can be reverse link pilot channel, channel qualityindicator channel, or any such reference channel. The value, pCoT, canbe communicated over a dedicated forward link channel (e.g., a forwardlink pilot quality channel (F-PQICH)) from the non-serving sector andobtained by appropriately adjusting the corresponding value for theserving sector using the channel gain difference values. The parametermaxIOTRise indicates the maximum allowable rise in the amount ofinterference caused by any access terminal or mobile device at anon-serving sector. This parameter can be a system configuration,overhead provide value or the like.

In the event that the delta value determined in the manner describedabove is smaller than the minimum delta value, delta_(min), a maximumsupportable bandwidth, W_(max), may be allocated downwards. Theallocation can be based on a predetermined value or based upon thefollowing:(averageIOT+W _(max) /W _(tot) *pCoT*delta_(min))/averageIOT<maxIOTRiseIn this example, W_(tot), is the total system bandwidth.

Accordingly to another example, open loop evaluator 204 may determine anopen loop value to control maximum PSD rise based upon an assignedbandwidth, W. Open loop evaluator 204 may compute the delta value suchthat the following is satisfied:(averageIOT+W/W _(tot) *pCoT*delta)/averageIOT<maxIOTRise

Pursuant to yet another illustration, open loop evaluator 204 maycontrol the amount of interference at the beginning of each bursttransmission by limiting the initial maximum supportable bandwidth basedon a current value of delta for controlling the average PSD rise. In theexample, open loop evaluator 204 may determine W_(max) such that thefollowing holds true:(averageIOT+W _(max) /W _(tot) *pCoT*delta)/averageIOT<maxIOTRiseThe determined W_(max) value can be communicated to the serving accesspoint of communications apparatus 200. The scheduler of the servingaccess point can gradually increase the bandwidth over subsequentassignments to allow sufficient time for OSI indications to result inadjustments to the delta value.

After determining an appropriate power level, power level evaluator 202or open loop evaluator 204, conveys the appropriate power level to powercontroller 206 of communications apparatus 206. Power controller 206sets the power level of transmissions of communications apparatus 206based upon the information conveyed by power level evaluator 202 and/oropen loop evaluator 204. Communications apparatus 200 operates at thenew power level until the evaluators 202 and 204 determine thatinterference changes warrant another adjustment.

Moreover, although not shown, it is to be appreciated thatcommunications apparatus 200 may include memory that retainsinstructions with respect to determining power level adjustments frombroadcasted interference levels, determining open loop power levels asinitial set points prior to commencement of burst traffic, controllingpower levels over a reverse link based on the determine power leveladjustments and/or open loop values, and the like. Further,communications apparatus 200 may include a processor that may beutilized in connection with executing instructions (e.g., instructionsretained within memory, instructions obtained from a disparate source, .. . ).

Turning now to FIG. 3, illustrated is a wireless communications system300 that effectuates power adjustment based upon considerations ofbroadcasted interference levels. System 300 includes a base station 302that communicates with a mobile device 304 (and/or any number ofdisparate mobile devices (not shown)). Base station 302 may transmitinformation to mobile device 304 over a forward link channel; furtherbase station 302 may receive information from mobile device 304 over areverse link channel. Moreover, system 300 may be a MIMO system.

Mobile device 304 may includes a power level evaluator 308 and a poweradjuster 310. Mobile device 304 receives interference indications frombase stations 302. Power level evaluator 308 utilizes the interferenceindications to evaluate any required power adjustments. Power levelevaluator 308 can determine power level delta values and/or open loopdelta values as described supra with reference to FIG. 2. Power adjuster310 employs the adjustment values determined by the power levelevaluator 308 to alter the power level of reverse link transmissions ofmobile device 304 to base station 302.

The amount of inter-cell interference caused by a given mobile device,such as mobile device 304, is determined by the transmit power levelused by the mobile device and the location of the mobile device relativeto access points or base stations in neighboring non-serving sectors.Base station 302 is the serving base station of mobile device 304. Basestation 302 broadcasts interference information on a broadcast physicalchannel of wireless system 300, which is received by mobile device 304and other mobile devices served by base station 302. For example, basestation 302 may broadcast interference parameters on a broadcastphysical channel. In accordance with another aspect, base station 302broadcasts interference information every small number of slots tofacilitate quick power adjustment to subsequent hybrid automatic repeattransmissions (HARQ) made for on-going packet transmissions. A HARQretransmission interval is a multiple of slots where a slot is the timeduration for a single HARQ sub-packet transmission. Retransmission ofhigh QoS packets can be adjusted in the event of a sudden rise ininterference. The broadcasts should be frequent to provide opportunitiesfor power changes. Moreover, interference information is a function offrequency such that multiple indications are broadcasted for multiplesubcarrier clusters. For example, multiple values may be broadcasted inOFDMA, LFDMA and the like since multiple access is done in the frequencydomain.

Base station 302 includes an interference evaluator 306 that measures aninterference level. The interference level, for example, can indicatethe amount of interference received by base station 302 as a result ofmobile device operating in non-serving sectors. The measuredinterference level can be compared to thermal or the like and used as aninput in the generation of the indication broadcasted. According to oneaspect of the subject disclosure, interference evaluator 306 can utilizeinterference over thermal (IOT) or rise over thermal (RoT). It should beappreciated that other similar interference metrics can be employed. Theinterference information broadcasted by base station 302 is utilized bymobile device 304 to adjust transmit power to maintain, for example, atarget carrier to interference ratio (C/I), signal-to-noise ratio (SNR),or other such interference type target.

The broadcasted interference information may comprise an instantaneousinterference level. However, if mobile devices, such as mobile device304, utilize the instantaneous level to adjust transmit power, wirelesssystem 300 can enter into a race condition. For example, bursty trafficarriving at an access terminal or base station in a neighboring sectorresults in a interference increase in other sectors such as the sectorserved by base station 302. Base station 302 broadcasts this increase tomobile device 304 and other mobile devices served. As a result of theinterference increase, mobile device 304 and others will increase power.The increase in power also raises interference for the original burstytraffic in the neighboring sector. Accordingly, the bursty traffic mayalso increase in power and so on resulting in decrease overallthroughput. The wireless system can ultimately become unstable

Accordingly, base station 302 broadcasts a function of the interferencelevel determined by interference evaluator 306 to enable mobile devicesserved to control power levels while mitigating power racing conditions.Pursuant to one aspect, the function of the interference level, forexample an IOT level, can be a minimum of a received IOT value or a IOTthreshold value for a power control algorithm (e.g., to control a powerrise or delta value, to calculate offset values such as delta values,etc.). In addition, the interference value can be a minimum of areceived IOT or a IOT ramp, where the IOT ramp limits the maximum IOTslew. Further, in accordance with yet another aspect, the IOT value,utilized as an interference value, can be broadcasted as a filteredvalue, IOT_filtered, where the filter can be one of a finite impulseresponse (FIR) or infinite impulse response (IIR). It should beappreciated that other such functions of interference level can beemployed provided that resultant broadcasted information enables mobiledevices to adjust power levels while mitigating race conditions.

Referring now to FIG. 4, a wireless communication system 400 inaccordance with various aspects presented herein is illustrated. System400 can comprise one or more access points 402 that receive, transmit,repeat, etc., wireless communication signals to each other and/or to oneor more terminals 404. Each base station 402 can comprise multipletransmitter chains and receiver chains, e.g., one for each transmit andreceive antenna, each of which can in turn comprise a plurality ofcomponents associated with signal transmission and reception (e.g.,processors, modulators, multiplexers, demodulators, demultiplexers,antennas, etc.). Terminals 404 can be, for example, cellular phones,smart phones, laptops, handheld communication devices, handheldcomputing devices, satellite radios, global positioning systems, PDAs,and/or any other suitable device for communicating over wireless system400. In addition, each terminal 404 can comprise one or more transmitterchains and a receiver chains, such as used for a multiple input multipleoutput (MIMO) system. Each transmitter and receiver chain can comprise aplurality of components associated with signal transmission andreception (e.g., processors, modulators, multiplexers, demodulators,demultiplexers, antennas, etc.), as will be appreciated by one skilledin the art.

As illustrated in FIG. 4, each access point provides communicationcoverage for a particular geographic area 406. The term “cell” can referto an access point and/or its coverage area, depending on context. Toimprove system capacity, an access point coverage area can bepartitioned into multiple smaller areas (e.g., three smaller areas 408A,408B and 208C). Each smaller area is served by a respective basetransceiver subsystem (BTS). The term “sector” can refer to a BTS and/orits coverage area depending upon context. For a sectorized cell, thebase transceiver subsystem for all sectors of the cell is typicallyco-located within the access point for the cell.

Terminals 404 are typically dispersed throughout system 400. Eachterminal 404 may be fixed or mobile. Each terminal 404 may communicatewith one or more access points 402 on the forward and reverse links atany given moment.

For a centralized architecture, a system controller 410 couples accesspoints 402 and provides coordination and control of access points 402.For a distributed architecture, access points 402 may communicate withone another as needed. Communication between access points via systemcontroller 410 or the like can be referred to as backhaul signaling.

The techniques described herein may be used for a system 400 withsectorized cells as well as a system with un-sectorized cells. Forclarity, the following description is for a system with sectorizedcells. The term “access point” is used generically for a fixed stationthat serves a sector as well as a fixed station that serves a cell. Theterms “terminal” and “user” are used interchangeably, and the terms“sector” and “access point” are also used interchangeably. A servingaccess point/sector is an access point/sector with which a terminalcommunicates. A neighbor access point/sector is an access point/sectorwith which a terminal is not in communication.

Referring to FIGS. 5-7, methodologies relating to reverse link poweradjustment based upon broadcasted interference information. While, forpurposes of simplicity of explanation, the methodologies are shown anddescribed as a series of acts, it is to be understood and appreciatedthat the methodologies are not limited by the order of acts, as someacts may, in accordance with one or more embodiments, occur in differentorders and/or concurrently with other acts from that shown and describedherein. For example, those skilled in the art will understand andappreciate that a methodology could alternatively be represented as aseries of interrelated states or events, such as in a state diagram.Moreover, not all illustrated acts may be required to implement amethodology in accordance with one or more embodiments.

Turning to FIG. 5, illustrated is a methodology 500 that facilitatesbroadcasting interference information in a wireless communicationsystem. At reference numeral 502, an interference level is determined.The interference level can be interference received by an access pointor base station or the value can be transmitted by other access pointsor base stations over the backhaul. In accordance with one aspect, theinterference level is represented as an interference over thermal (IOT)value. At reference numeral 504, a function of the interference level isdetermined Utilizing solely the interference level determined at 502 mayresult in racing conditions among mobile devices. Employing a functionof the interference level mitigates racing. The function can be anaverage IOT, a minimum between received IOT and a threshold, a minimumbetween received IOT and an IOT ramp value, a filtered IOT value orother such function. At reference numeral 506, the function of theinterference level is broadcasted. The function can be broadcasted on aphysical broadcast channel from a base station to a plurality of mobiledevices.

Turning to FIG. 6, illustrated is a methodology 600 that facilitatesadjusting transmit power level based upon considerations of broadcastedinterference information. At reference numeral 602, interferenceinformation is received. The interference information can include aninterference over thermal value or a function thereof. At referencenumeral 604, a power control offset is determined. The offset isdetermined based upon considerations of the interference informationreceived. The received information is employed to map an interferencetarget (e.g., target C/I, target SNR, etc.) to a PSD value. The PSDvalue, for example, can be employed as the power control offset utilizedto adjust transmit power in accordance with the received interferenceinformation. At reference numeral 606, transmit power is adjusted basedupon the determined power control offset.

Now referring to FIG. 7, illustrated is a methodology 700 thatfacilitates setting an initial transmit power level prior to commencingbursty traffic. At reference numeral 702, an open loop offset isevaluated. The open loop offset value is a projected power leveladjustment determined during a silence period to prevent a large suddenincrease in interference. At 704, a transmit power is established inaccordance with the open loop offset value. At reference numeral 706,burst traffic is initiated utilizing the adjusted power level tomitigate initial interference increase. After commencement of the bursttraffic, power control may occur as described supra with reference toFIGS. 5 and 6.

It will be appreciated that, in accordance with one or more aspectsdescribed herein, inferences can be made regarding determininginterference levels, determining which functions of interference levelsto employ, determining power level adjustments based upon considerationsof broadcasted interference information, determining relevant parametersfor power level decisions, etc. As used herein, the term to “infer” or“inference” refers generally to the process of reasoning about orinferring states of the system, environment, and/or user from a set ofobservations as captured via events and/or data. Inference can beemployed to identify a specific context or action, or can generate aprobability distribution over states, for example. The inference can beprobabilistic—that is, the computation of a probability distributionover states of interest based on a consideration of data and events.Inference can also refer to techniques employed for composinghigher-level events from a set of events and/or data. Such inferenceresults in the construction of new events or actions from a set ofobserved events and/or stored event data, whether or not the events arecorrelated in close temporal proximity, and whether the events and datacome from one or several event and data sources.

According to an example, one or more methods presented above can includemaking inferences pertaining to evaluating an interference level andchoosing a function of the interference level to mobile devices via abroadcast. By way of further illustration, an inference may be maderelated to determining a power level adjustment on a reverse linktransmission based upon consideration of broadcasted interferenceinformation. It will be appreciated that the foregoing examples areillustrative in nature and are not intended to limit the number ofinferences that can be made or the manner in which such inferences aremade in conjunction with the various embodiments and/or methodsdescribed herein.

FIG. 8 is an illustration of a mobile device 800 that facilitatesadjusting reverse link power based upon considerations of broadcastedinterference information. Mobile device 800 comprises a receiver 802that receives a signal from, for instance, a receive antenna (notshown), and performs typical actions thereon (e.g., filters, amplifies,downconverts, etc.) the received signal and digitizes the conditionedsignal to obtain samples. Receiver 802 can be, for example, an MMSEreceiver, and can comprise a demodulator 804 that can demodulatereceived symbols and provide them to a processor 806 for channelestimation. Processor 806 can be a processor dedicated to analyzinginformation received by receiver 802 and/or generating information fortransmission by a transmitter 816, a processor that controls one or morecomponents of mobile device 800, and/or a processor that both analyzesinformation received by receiver 802, generates information fortransmission by transmitter 816, and controls one or more components ofmobile device 800.

Mobile device 800 can additionally comprise memory 808 that isoperatively coupled to processor 806 and that may store data to betransmitted, received data, information related to available channels,data associated with analyzed signal and/or interference strength,information related to an assigned channel, power, rate, or the like,and any other suitable information for estimating a channel andcommunicating via the channel. Memory 808 can additionally storeprotocols and/or algorithms associated with estimating and/or utilizinga channel (e.g., performance based, capacity based, etc.).

It will be appreciated that the data store (e.g., memory 808) describedherein can be either volatile memory or nonvolatile memory, or caninclude both volatile and nonvolatile memory. By way of illustration,and not limitation, nonvolatile memory can include read only memory(ROM), programmable ROM (PROM), electrically programmable ROM (EPROM),electrically erasable PROM (EEPROM), or flash memory. Volatile memorycan include random access memory (RAM), which acts as external cachememory. By way of illustration and not limitation, RAM is available inmany forms such as synchronous RAM (SRAM), dynamic RAM (DRAM),synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhancedSDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct Rambus RAM (DRRAM).The memory 808 of the subject systems and methods is intended tocomprise, without being limited to, these and any other suitable typesof memory.

Receiver 802 is further operatively coupled to a power level evaluator810 that determines a power level adjustment for mobile device 800 basedupon broadcasted interference information from a base station. Thebroadcasted interference information may comprise an interference leveland/or a function thereof. For example, the interference information canbe a function comprising a minimum of a received IOT value and a IOTthreshold for a wireless system. Power level evaluator 810 uses theinterference information to correspond target interference metrics to adelta power level value or PSD. Additionally, a power controller 812 mayutilize the delta power level value or PSD evaluated by power levelevaluator 810 to modify the transmit power level of mobile device 800.Mobile device 800 still further comprises a modulator 814 and atransmitter 816 that transmits a signal (e.g., base CQI and differentialCQI) to, for instance, a base station, another mobile device, etc.Although depicted as being separate from the processor 806, it is to beappreciated that power level evaluator 810, power controller 812 and/ormodulator 814 may be part of processor 806 or a number of processors(not shown).

FIG. 9 is an illustration of a system 900 that facilitates reducing theamount of feedback required to control forward link transmission in aMIMO system implementing a PGRC scheme. System 900 comprises a basestation 902 (e.g., access point, . . . ) with a receiver 910 thatreceives signal(s) from one or more mobile devices 904 through aplurality of receive antennas 906, and a transmitter 920 that transmitsto the one or more mobile devices 904 through a transmit antenna 908.Receiver 910 can receive information from receive antennas 906 and isoperatively associated with a demodulator 912 that demodulates receivedinformation. Demodulated symbols are analyzed by a processor 914 thatcan be similar to the processor described above with regard to FIG. 8,and which is coupled to a memory 916 that stores information related toestimating a signal (e.g., pilot) strength and/or interference strength,data to be transmitted to or received from mobile device(s) 904 (or adisparate base station (not shown)), and/or any other suitableinformation related to performing the various actions and functions setforth herein. Processor 914 is further coupled to an interference levelevaluator 918 that determines a level of receive interference and/or afunction thereof. Interference level evaluator 918 evaluates theinterference level or receives a value over the backhaul fromneighboring sectors. For example, interference level evaluator 918 maymeasure the interference received and compare it to thermal to generatean interference level such as IOT.

Interference level evaluator 918 is coupled to transmitter 922 throughmodulator 920. The interference level determined by interference levelevaluator 918 is broadcasted by transmitter 922 through transmitantennas 908 to mobile device(s) 904. Modulator 920 can multiplex thecontrol information for transmission by a transmitter 922 throughantenna 908 to mobile device(s) 904. Mobile devices 904 can be similarto mobile device 800 described with reference to FIG. 8 and employ thebroadcasted information to adjust power levels on the reverse link.Interference level evaluator 918 may instruct a function of theinterference level to be broadcasted as opposed to the instantaneousinterference level to mitigate racing conditions. For example, theinterference information broadcasted can be a minimum of a received IOTor a IOT ramp, where the IOT ramp limits the maximum IOT slew. It shouldbe appreciated that other functions can be utilized in accordance withthe subject disclosure. Although depicted as being separate from theprocessor 914, it is to be appreciated that interference level evaluator918 and/or modulator 920 may be part of processor 914 or a number ofprocessors (not shown).

FIG. 10 shows an example wireless communication system 1000. Thewireless communication system 1000 depicts one base station 1010 and onemobile device 1050 for sake of brevity. However, it is to be appreciatedthat system 1000 may include more than one base station and/or more thanone mobile device, wherein additional base stations and/or mobiledevices may be substantially similar or different from example basestation 1010 and mobile device 1050 described below. In addition, it isto be appreciated that base station 1010 and/or mobile device 1050 mayemploy the systems (FIGS. 1-4 and 8-9) and/or methods (FIGS. 6-7)described herein to facilitate wireless communication there between.

At base station 1010, traffic data for a number of data streams isprovided from a data source 1012 to a transmit (TX) data processor 1014.According to an example, each data stream may be transmitted over arespective antenna. TX data processor 1014 formats, codes, andinterleaves the traffic data stream based on a particular coding schemeselected for that data stream to provide coded data.

The coded data for each data stream may be multiplexed with pilot datausing orthogonal frequency division multiplexing (OFDM) techniques.Additionally or alternatively, the pilot symbols can be frequencydivision multiplexed (FDM), time division multiplexed (TDM), or codedivision multiplexed (CDM). The pilot data is typically a known datapattern that is processed in a known manner and may be used at mobiledevice 1050 to estimate channel response. The multiplexed pilot andcoded data for each data stream may be modulated (e.g., symbol mapped)based on a particular modulation scheme (e.g., binary phase-shift keying(BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying(M-PSK), M-quadrature amplitude modulation (M-QAM), etc.) selected forthat data stream to provide modulation symbols. The data rate, coding,and modulation for each data stream may be determined by instructionsperformed or provided by processor 1030.

The modulation symbols for the data streams may be provided to a TX MIMOprocessor 1020, which may further process the modulation symbols (e.g.,for OFDM). TX MIMO processor 1020 then provides N_(T) modulation symbolstreams to N_(T) transmitters (TMTR) 1022 a through 1022 t. In variousembodiments, TX MIMO processor 1020 applies beamforming weights to thesymbols of the data streams and to the antenna from which the symbol isbeing transmitted.

Each transmitter 1022 receives and processes a respective symbol streamto provide one or more analog signals, and further conditions (e.g.,amplifies, filters, and upconverts) the analog signals to provide amodulated signal suitable for transmission over the MIMO channel.Further, N_(T) modulated signals from transmitters 1022 a through 1022 tare transmitted from N_(T) antennas 1024 a through 1024 t, respectively.

At mobile device 1050, the transmitted modulated signals are received byN_(R) antennas 1052 a through 1052 r and the received signal from eachantenna 1052 is provided to a respective receiver (RCVR) 1054 a through1054 r. Each receiver 1054 conditions (e.g., filters, amplifies, anddownconverts) a respective signal, digitizes the conditioned signal toprovide samples, and further processes the samples to provide acorresponding “received” symbol stream.

An RX data processor 1060 may receive and process the N_(R) receivedsymbol streams from N_(R) receivers 1054 based on a particular receiverprocessing technique to provide N_(T) “detected” symbol streams. RX dataprocessor 1060 may demodulate, deinterleave, and decode each detectedsymbol stream to recover the traffic data for the data stream. Theprocessing by RX data processor 1060 is complementary to that performedby TX MIMO processor 1020 and TX data processor 1014 at base station1010.

A processor 1070 may periodically determine which precoding matrix toutilize as discussed above. Further, processor 1070 may formulate areverse link message comprising a matrix index portion and a rank valueportion.

The reverse link message may comprise various types of informationregarding the communication link and/or the received data stream. Thereverse link message may be processed by a TX data processor 1038, whichalso receives traffic data for a number of data streams from a datasource 1036, modulated by a modulator 1080, conditioned by transmitters1054 a through 1054 r, and transmitted back to base station 1010.

At base station 1010, the modulated signals from mobile device 1050 arereceived by antennas 1024, conditioned by receivers 1022, demodulated bya demodulator 1040, and processed by a RX data processor 1042 to extractthe reverse link message transmitted by mobile device 1050. Further,processor 1030 may process the extracted message to determine whichprecoding matrix to use for determining the beamforming weights.

Processors 1030 and 1070 may direct (e.g., control, coordinate, manage,etc.) operation at base station 1010 and mobile device 1050,respectively. Respective processors 1030 and 1070 can be associated withmemory 1032 and 1072 that store program codes and data. Processors 1030and 1070 can also perform computations to derive frequency and impulseresponse estimates for the uplink and downlink, respectively.

It is to be understood that the embodiments described herein may beimplemented in hardware, software, firmware, middleware, microcode, orany combination thereof. For a hardware implementation, the processingunits may be implemented within one or more application specificintegrated circuits (ASICs), digital signal processors (DSPs), digitalsignal processing devices (DSPDs), programmable logic devices (PLDs),field programmable gate arrays (FPGAs), processors, controllers,micro-controllers, microprocessors, other electronic units designed toperform the functions described herein, or a combination thereof.

When the embodiments are implemented in software, firmware, middlewareor microcode, program code or code segments, they may be stored in amachine-readable medium, such as a storage component. A code segment mayrepresent a procedure, a function, a subprogram, a program, a routine, asubroutine, a module, a software package, a class, or any combination ofinstructions, data structures, or program statements. A code segment maybe coupled to another code segment or a hardware circuit by passingand/or receiving information, data, arguments, parameters, or memorycontents. Information, arguments, parameters, data, etc. may be passed,forwarded, or transmitted using any suitable means including memorysharing, message passing, token passing, network transmission, etc.

For a software implementation, the techniques described herein may beimplemented with modules (e.g., procedures, functions, and so on) thatperform the functions described herein. The software codes may be storedin memory units and executed by processors. The memory unit may beimplemented within the processor or external to the processor, in whichcase it can be communicatively coupled to the processor via variousmeans as is known in the art.

With reference to FIG. 11, illustrated is a system 1100 that facilitatesgenerates an interference indication to be broadcasted to a plurality ofmobile devices. For example, system 1100 may reside at least partiallywithin a base station. It is to be appreciated that system 1100 isrepresented as including functional blocks, which may be functionalblocks that represent functions implemented by a processor, software, orcombination thereof (e.g., firmware). System 1100 includes a logicalgrouping 1102 of electrical components that can act in conjunction. Forinstance, logical grouping 1102 may include an electrical component foridentifying an interference level 1104. For example, mobile devices innon-serving sectors cause interference to a base station in aneighboring sector. Further, logical grouping 1102 may comprise anelectrical component for evaluating a function of the interference level1106. For example, a minimum between an interference value received at abase station and an interference threshold value can be determined.Employing a function value of the interference level mitigates racingconditions that may result when utilizing instantaneous interferencelevel values alone. Moreover, logical grouping 1102 may include anelectrical component for transmitting the interference level to aplurality of mobile devices 1108. According to an example, a broadcastphysical channel can be employed to convey the interference level and/ora function thereof to all mobile devices within a serving sector.Additionally, system 1100 may include a memory 1110 that retainsinstructions for executing functions associated with electricalcomponents 1104, 1106, and 1108. While shown as being external to memory1110, it is to be understood that one or more of electrical components1104, 1106, and 1108 may exist within memory 1110.

Turning to FIG. 12, illustrated is a system 1200 that adjusts power on areverse link. System 1200 may reside within a mobile device, forinstance. As depicted, system 1200 includes functional blocks that mayrepresent functions implemented by a processor, software, or combinationthereof (e.g., firmware). System 1200 includes a logical grouping 1202of electrical components that facilitate controlling forward linktransmission. Logical grouping 1202 may include an electrical componentfor receiving an interference indication 1204. For example, a receiverantenna can be included in a mobile device through which broadcastedsignals from a serving base station can be captured and processed. Theinterference indication includes information related to interferencereceived at a serving base station caused by activity of other mobiledevices in non-serving sectors. Moreover, logical grouping 1202 mayinclude an electrical component for determining a power adjustment value1206. For example, the power adjustment value is evaluated based uponthe received interference indication. According to one aspect, a poweradjustment value that indicates power should be increased can beevaluated when the interference indication shows an increase ininterference. The power increase allows a mobile device to achieve atarget SNR (or other such target type) despite the increasedinterference. Further, logical grouping 1202 may comprise an electricalcomponent for modifying a transmit power level 1208. After evaluatingthe power adjustment value, the transmitter on the reverse link of amobile device can be modified by altering the power employed inaccordance with the adjustment value. Additionally, system 1200 mayinclude a memory 1210 that retains instructions for executing functionsassociated with electrical components 1204, 1206, and 1208. While shownas being external to memory 1210, it is to be understood that electricalcomponents 1204, 1206, and 1208 may exist within memory 1210.

What has been described above includes examples of one or moreembodiments. It is, of course, not possible to describe everyconceivable combination of components or methodologies for purposes ofdescribing the aforementioned embodiments, but one of ordinary skill inthe art may recognize that many further combinations and permutations ofvarious embodiments are possible. Accordingly, the described embodimentsare intended to embrace all such alterations, modifications andvariations that fall within the spirit and scope of the appended claims.Furthermore, to the extent that the term “includes” is used in eitherthe detailed description or the claims, such term is intended to beinclusive in a manner similar to the term “comprising” as “comprising”is interpreted when employed as a transitional word in a claim.

What is claimed is:
 1. A method that facilitates adjusting power basedupon interference information, the method comprising: receiving aninterference indication; evaluating a first power adjustment value basedat least in part on the received interference indication; adjustingtransmit power on the reverse link based upon the first power adjustmentvalue; and determining an open loop power adjustment value duringperiods of inactivity, wherein the open loop power adjustment valuecontrols a maximum value of the first power adjustment value during theperiods of inactivity.
 2. The method of claim 1, further comprisingutilizing the open loop power adjustment to modify a transmit powerlevel prior to burst data traffic.
 3. The method of claim 1, whereinevaluating the first power adjustment value comprises evaluating thefirst power adjustment value based upon quality of service (QoS)parameters.
 4. The method of claim 1, wherein evaluating the first poweradjustment value comprises evaluating the first power adjustment valuebased upon a location of a mobile device relative to non-serving basestations.
 5. The method of claim 4, wherein transmit power on thereverse link increases as a distance to non-serving base stationincreases.
 6. A wireless communications apparatus, comprising: a memorythat retains instructions related to processing an interference value ona broadcast channel, inferring a first power adjustment value based uponthe interference value, changing a power level according to the poweradjustment value, and determining an open loop power adjustment valueduring periods of inactivity, wherein the open loop power adjustmentvalue controls a maximum value of the first power adjustment valueduring the periods of inactivity; and an integrated circuit coupled tothe memory, configured to execute the instructions retained in thememory.
 7. A wireless communications apparatus that adjusts power on areverse link, the wireless communications apparatus comprising: meansfor receiving an interference indication from a broadcast channel; meansfor determining a first power adjustment value based upon theinterference indication; means for modifying a transmit power level inaccordance with the first power adjustment value; and means fordetermining an open loop power adjustment value during periods ofinactivity, wherein the power adjustment value controls a maximum valueof the first power adjustment value during the periods of inactivity. 8.The wireless communications apparatus of claim 7, further comprising:means for evaluating an initial transmit power set point prior totransmission; and means for adjusting reverse link power level accordingto the initial power set point.
 9. A non-transitory computer-readablemedium, comprising: code for causing a computer to receive a broadcastedinterference value; code for causing a computer to evaluate a powercorrection parameter based at least in part on the received interferencevalue; code for causing a computer to modify transmit power on thereverse link based upon the power correction value; and code for causinga computer to determine an open loop power adjustment value duringperiods of inactivity, wherein the power adjustment value controls amaximum value of the power correction parameter during the periods ofinactivity.
 10. The computer-readable medium of claim 9, furthercomprising code for utilizing the open loop power adjustment value tomodify a transmit power level prior to burst data traffic.
 11. Thecomputer-readable medium of claim 9, wherein the code for evaluating thepower correction parameter comprises code for evaluating the powercorrection parameter based upon quality of service (QoS) parameters. 12.The computer-readable medium of claim 9, wherein the code for evaluatingthe power correction parameter comprises code for evaluating the powercorrection parameter based upon a location of to at least onenon-serving base station.
 13. The computer-readable medium of claim 12,wherein transmit power on the reverse link increases as a distance tothe at least one non-serving base station increases.
 14. In a wirelesscommunication system, an apparatus comprising: an integrated circuitconfigured to: evaluate a power adjustment quantity based at least inpart upon consideration of broadcasted interference values related tonon-serving sectors; adjust a transmit power level on a reverse link inaccordance with the power adjustment quantity; and determine an openloop power adjustment value during periods of inactivity, wherein theopen loop power adjustment value controls a maximum value of the poweradjustment quantity during the periods of inactivity.
 15. The method ofclaim 1, wherein the interference indication comprises an interferencevalue determined as the output of a function with a receivedinterference over thermal (IOT) value as the input.
 16. The wirelesscommunications apparatus of claim 6, wherein the interference indicationcomprises an interference value determined as the output of a functionwith a received interference over thermal (IOT) value as the input. 17.The wireless communications apparatus of claim 7, wherein theinterference indication comprises an interference value determined asthe output of a function with a received interference over thermal (IOT)value as the input.